diff --git a/src/autoconf/configure.in b/src/autoconf/configure.in
index e2f9b03..39c0936 100644
--- a/src/autoconf/configure.in
+++ b/src/autoconf/configure.in
@@ -1317,7 +1317,8 @@ for TESTPATH in "" "/usr/local/include"; do
         CFLAGS="-I$TESTPATH $saveflags"
     fi
 AC_TRY_COMPILE([
-#include <iconv.h>
+#include <sys/iconv.h>
+#endif
 
 iconv_t * foo(void)
 {